The effect of two glass ceramic materials bonded with light and dual cure resin cement on the fracture resistance of anterior sectional veneers following cyclic loading: (In-vitro study)

Document Type : Original Article

Authors

1 B.D.S October University for modern Sciences and Arts, Egypt

2 Professor in Department of Fixed Prosthodontics, Faculty of Dentistry, October University for modern Sciences and Arts, Egypt University

3 MSA University

4 Lecturer in Department of Fixed Prosthodontics, Faculty of Dentistry, October University for modern Sciences and Arts, Egypt

Abstract

Objective: This study aimed to evaluate the fracture resistance following aging of anterior sectional veneers fabricated from two different glass ceramic materials, bonded with resin cement under different curing modes. Materials and methods: Forty extracted human central incisors were collected. Samples were randomly divided into two groups according to ceramic material used lithium disilicate glass ceramic (IPS e.max press) and zirconia reinforce lithium silicate glass ceramic (Celtra press). Then the two main groups were subdivided into 4 subgroups according to resin cement used; light cure resin cement or dual cure resin cement (n=10). Teeth were held into epoxy resin blocks milled by CAD/CAM technology. Samples were prepared, cemented then subjected to 10000 cycles of artificial accelerated aging, in addition to 120,000 cycles of dynamic loading. All samples were subjected to universal testing machine to determine fracture resistance values. Statistical analysis: All date collected were statistically analyzed by One-way ANOVA followed by Tukey’s post hoc test. Results: Significant difference (p<0.001) between the two materials, where Celtra Press glass ceramics showed higher fracture resistance value (674.81±78.29 ) compared with Ips Emax Press glass ceramic (396.76 ±84.32 ). Dual cure resin cements showed significantly (p=0.001) higher strength values (601.58 ±152.99) compared to light cure resin adhesive (469.99 ±160.71). Conclusions: Celtra Press glass ceramic possessed enhanced fracture resistance value compared to IPs Emax Press glass ceramic for restoring teeth with sectional veneers. Dual curing mode of resin cement possessed greater fracture resistance compared to light curing mode.

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